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An event can be active (open) or stopped (closed). Active means that the event scheduler checks whether the event action must be called. Stopping means that the declaration of the event is stored in the directory, but the scheduler does not check whether it should be called. After an event is created, it becomes active immediately, and an active event can be executed once or more times.The observer mode defines a one-to-many dependency relationship, allowing multiple observer objects to monitor a certain topic object at the same time. When the state of this topic object changes, all observer objects will be notified so that they can automatically update their behaviors. The specific structure diagram is as follows:The status switching of file upload is much more complicated than that of file upload. The process of controlling file upload requires two node buttons, the first is used to pause and continue upload, and the second is used to delete files.草长莺飞的三月，一大批少年奔赴清辉县城，去博取那未知的前程。《49日》讲述南奎丽饰演大婚在即的女子，但却在婚礼前一星期发生意外灵魂离开身体，并被死神告之若言能在49天内找到除亲人外三个愿意为自己流泪的人就能还魂的事实。而丁一宇则饰演掌管人类死亡日期和抓拿死后灵魂的使者，在与南奎丽相处中产生微妙的感情并破例协助她重新返回人间。